Overview
The ZF 4644.103.477 OUTPUT for WG180/WG200 is a critical driveline component engineered to transfer rotational force from the transmission’s planetary gear set to the output shaft. Positioned at the rear of the transmission housing, this OEM genuine part ensures precise torque delivery and alignment under heavy-duty loads. The SKU 4644.103.477 is specifically designed for ZF’s WG 180 and WG 200 series, where it interfaces directly with the 4644105475 DISCONNECTION mechanism and the 4642303097 OUTPUT FLANGE to maintain drivetrain integrity. This part is manufactured to ZF’s original tolerances, guaranteeing a seamless fit and long service life in construction, agricultural, and industrial machinery.
Symptoms of Failure
- Oil leaks near the rear transmission seal: A worn 4644.103.477 output often causes hydraulic fluid to seep past the seal, leading to low oil levels and potential gear damage.
- Gear slipping under load: When the output component loses its spline engagement, you may experience intermittent power loss or erratic shifting during heavy operation.
- Vibration or driveline shudder: Excessive play in the output assembly creates noticeable vibration at the driveshaft, especially during acceleration or deceleration.
- Metallic grinding noises: Advanced wear can produce a high-pitched grinding sound from the rear of the transmission, indicating internal contact between the output and the 4644101134 TRANSMISSION HOUSING.
Technical Specifications
| Specification | Detail |
|---|---|
| Part Number | 4644.103.477 |
| Material | High-strength alloy steel (case-hardened) |
| Weight | 4.8 kg (10.6 lbs) |
| Outer Diameter | 145 mm |
| Spline Count | 24 internal splines |
| OEM Reference | ZF 4644.103.477 |
| Fastener Torque | 120 Nm (88.5 lb-ft) with 0636020211 HEXAGON SCREW |
Compatibility
This genuine ZF output is engineered for the WG 180 and WG 200 transmission series. It is a direct replacement for models including WG180, WG200, WG180/200, and WG200/180 variants used in off-highway vehicles, wheel loaders, and dump trucks. The part also fits select ZF Ecomat and Ecolife derivatives that share the same rear output architecture. Always verify your transmission’s serial number against the OEM parts list to ensure compatibility with the 4642303097 OUTPUT FLANGE and associated hardware.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4644105475 | DISCONNECTION | Engages/disengages output shaft from driveline |
| 4642303097 | OUTPUT FLANGE | Connects output to driveshaft yoke |
| 0636020211 | HEXAGON SCREW | Secures output flange to shaft |
| 4644101134 | TRANSMISSION HOUSING | Encloses gearset and output assembly |
| 4644301349 | HOUSING | Rear housing cover for output section |
| 0730365125 | TYPE PLATE | Identification plate for transmission model |
| 0631311009 | GROOVED STUD | Alignment dowel for housing assembly |
| 0636305019 | SCREW PLUG | Seals oil passages in output area |
| 4644301247 | THREADED BUSH | Provides threaded insert for mounting |
| 0634303485 | O-RING | Prevents oil leakage at output joint |
